Superplastic Forming of Grain Boundary Controlled Ceramics

我们正在致力于陶瓷的超塑性研究，特别是为了突破目前超塑性研究的局限性。过去对超塑性的研究主要是通过分析流动应力与应变速率的关系来寻找速率控制机制。这是理解包括焦煤在内的超塑性流动不变材料的有效途径之一。然而，这种宏观分析的局限性在于很难弄清超塑性流动的原子机制。我们对超塑性陶瓷的晶界结构和晶界中的化学键状态进行了分析，认为我们的微观方法无疑是突破板状陶瓷材料超塑性研究的一个新的挑战，因为超塑性陶瓷材料的流动行为对晶界化学化和原子键态非常敏感。我们的新方法是超塑性研究中的一项创新。

We are working on the superplasticity in ceramics with a special interest to break through the present limitations in superplasticity research. The past research on superplasticity was made mainly by analysing the flow stress against strain rate relationship to find a rate-controlling mechanism. This is one of the effective ways to understand the superplastic flow invarious materials including caramics. However, the limitation of this type of macroscopic analusis is in the tact that it is hard to make clear the atomistic mechanism of superplastic flow. We examined to analyze the grain b'ry structure and the chemical bonding state in grain b'ries of superplastic ceramics, and formed that our very microscopic approach is, no doubt, a new challenge to break through the study on superplasticity, in pavticular, ceramic materials, in which the flow behavior is very sensitive to grain b'ry chemisfy and atomic bonding state. Our new approach is aninnovation in superplasticity research.